The syntax used for representing complex numbers in Pyxplot differs from that used in gnuplot. Whereas gnuplot expects the real and imaginary components of complex numbers to be represented {a,b}, Pyxplot uses the syntax a+b*i, assuming that the variable i has been defined to equal sqrt(-1). In addition, in Pyxplot complex arithmetic must first be enabled using the set numerics complex command before complex numbers may be entered. This is illustrated by the following example:
gnuplot> print {1,2} + {3,4}
{4.0, 6.0}
pyxplot> set numerics complex
pyxplot> print (1+2*i) + (3+4*i)
(4+6i)